LiveActive security incident?Get immediate response
CVE Record

CVE-2021-4376: WooCommerce Multi Currency <= 2.1.17 - Missing Authorization

The WooCommerce Multi Currency plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 2.1.17. This makes it possible for authenticated attackers to change the price of a product to an arbitrary value.

MediumCVSS 4.3Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw affects the WooCommerce Multi Currency WordPress plugin through version 2.1.17. A logged-in attacker could change a product price to an arbitrary value, creating direct revenue and transaction-integrity risk for affected ecommerce sites.

Executive priority

Treat this as a targeted ecommerce integrity issue, not a broad infrastructure emergency. Prioritize internet-facing WooCommerce stores with customer accounts, many users, or recent unexplained pricing anomalies.

Technical view

CVE-2021-4376 is a missing authorization issue (CWE-862) in WooCommerce Multi Currency. The CVSS 3.1 score is 4.3: network-accessible, low complexity, low privileges required, no user interaction, and limited integrity impact.

Likely exposure

Exposure is likely limited to WordPress/WooCommerce sites running WooCommerce Multi Currency version 2.1.17 or earlier with attacker-accessible authenticated accounts.

Exploitation context

The provided sources do not indicate CISA KEV listing or active exploitation. Risk depends on whether untrusted or compromised WordPress accounts can reach the vulnerable price-changing function.

Researcher notes

The source bundle identifies the issue as missing authorization and describes arbitrary product price modification by authenticated attackers. It does not provide safe validation details, exploit evidence, or a complete remediation narrative beyond affected versions and vendor references.

Mitigation direction

  • Identify all sites using WooCommerce Multi Currency.
  • Upgrade affected installations according to WordPress.org or vendor guidance.
  • Remove or disable the plugin if it cannot be updated safely.
  • Restrict WordPress accounts to trusted users with least privilege.
  • Audit recent product price changes and suspicious user activity.

Validation and detection

  • Check each WordPress site for WooCommerce Multi Currency installation.
  • Confirm whether installed versions are 2.1.17 or earlier.
  • Review plugin changelog and vendor notes for the relevant fix status.
  • Inspect ecommerce records for unexpected price changes.
  • Verify only authorized roles can modify product pricing.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-862: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-4376 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.3Medium
CVSS 3.1 vector shape for CVE-2021-4376Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
villathemeCURCY – Multi Currency for WooCommerce – Smoothly on WooCommerce 9.x0unaffected
Weakness

CWE details

CWE-862

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-862 · source CWE mapping

Missing Authorization

Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs